Pmcc and regression Flashcards
1
Q
r=0
A
no correlation
2
Q
r=1
A
perfect positive correlation
3
Q
r=-1
A
perfect negative correlation
4
Q
interpretation
A
explain to a dumb person
5
Q
draw regression line
A
- rearrange to y = mx + c
- sub last ‘x’ to get last point
- connect the two points
6
Q
why regression line is reliable / should use it
A
- within range of data
2. b/c pmcc is strong
7
Q
what is ‘a’ in regression eqt
A
when x = 0 , y = a
8
Q
when is ‘b’ in regression eqt
A
every 1 of x, b of y
9
Q
what is ‘x’ in regression eqt
A
indepedant variable
10
Q
what is ‘y’ in regression eqt
A
dependant variable
11
Q
if outlier
A
if goes w/ correlation = increase correlation = closer to 1/ -1 (perfect correlation) = increases / decreases
12
Q
S xx to o
A
- /n
2. sqr ans
